Revision of Lithostrotionella - USGS
Revision of Lithostrotionella - USGS
Revision of Lithostrotionella - USGS
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GEOLOGICAL SURVEY PROFESS!Oi\'AL PAPER 12-17 PLATE 16<br />
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ACROCYATHUS PROLIFERUS (HALL) AND ACROCYATHUS FLORIFORMIS FLORIFORMIS D'ORBIGNY